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How Salty Is the Ocean?
How Salty Is the Ocean? In general, the salinity (saltiness) of the ocean is 3.5 percent by volume. A gallon of seawater contains about…
What Are the Hormones That Affect Your Appetite?
What Are the Hormones That Affect Your Appetite? Modern research is showing that several varying hormones transmit or dampen hunger signals,
How Are the Pictures Formed on Camera Film?
How Are the Pictures Formed on Camera Film? Photographic film is a thin sheet of plastic, coated with special chemicals. Where light rays hi
How Does a Magnetic Compass Tell Direction?
How Does a Magnetic Compass Tell Direction? A magnetic compass is the most well known type of compass, which has become so popular that…
Why the Years in the 2000s Are Called the 21st Century?
Why the Years in the 2000s Are Called the 21st Century? It appears that we are a century ahead of our calendar because we…